Asking for a friend.
He shot a tactical match (100 yards or less) a couple of weeks ago with this scope mounted on an M&P-15 VTAC using a LaRue LT104 and shooting Wolf steel case ammunition. This is a solid setup that he had been using every month for about 5 years. Accurate enough at 100 yards to consistently hit a reduced size IPSIC steel silhouette target with no problem. Not usually the top shooter but easily in top 10-20% and scope has never lost a zero.
This time shooting 18 of the above targets took him about 50 rounds instead of the normal 20-25. Finally got out to the range today to check the gun out. When we open the scope caps (which were both on tight) we found that his elevation dial was 1.5 MOA lower (see image) than what he had set it to a few months ago, windage was unchanged. He had zero this rifle in the past for both Wolf and his own handloads. The Wolf for 100 yards (white paint dot) and his handload with 77 grain SMK (green dot – 100 and 200 yards). He had check this scope a few months back this year and make sure elevation and windage was each on respective the white dot. He have not open the scope cap covers since then.
We took the gun out today and shot it on a rest at 100 yards – 5 rounds each target (see image). Right target with the elevation as is, and left target with it dialed back to the white dot. Group size is as what you expect with Wolf, 2-3 MOA. As you can see, the properly adjusted scope shot pretty close to center (Red dot is center with analysis bye OnTargetCalc.com) with the unadjusted scope rifle shooting significantly lower. Obviously, the aim is not so far off that it will cause a complete miss all the time but as expected, it will increase the chance for a miss which is basically what we saw at the match.
So what do people think happened?
He shot a tactical match (100 yards or less) a couple of weeks ago with this scope mounted on an M&P-15 VTAC using a LaRue LT104 and shooting Wolf steel case ammunition. This is a solid setup that he had been using every month for about 5 years. Accurate enough at 100 yards to consistently hit a reduced size IPSIC steel silhouette target with no problem. Not usually the top shooter but easily in top 10-20% and scope has never lost a zero.
This time shooting 18 of the above targets took him about 50 rounds instead of the normal 20-25. Finally got out to the range today to check the gun out. When we open the scope caps (which were both on tight) we found that his elevation dial was 1.5 MOA lower (see image) than what he had set it to a few months ago, windage was unchanged. He had zero this rifle in the past for both Wolf and his own handloads. The Wolf for 100 yards (white paint dot) and his handload with 77 grain SMK (green dot – 100 and 200 yards). He had check this scope a few months back this year and make sure elevation and windage was each on respective the white dot. He have not open the scope cap covers since then.
We took the gun out today and shot it on a rest at 100 yards – 5 rounds each target (see image). Right target with the elevation as is, and left target with it dialed back to the white dot. Group size is as what you expect with Wolf, 2-3 MOA. As you can see, the properly adjusted scope shot pretty close to center (Red dot is center with analysis bye OnTargetCalc.com) with the unadjusted scope rifle shooting significantly lower. Obviously, the aim is not so far off that it will cause a complete miss all the time but as expected, it will increase the chance for a miss which is basically what we saw at the match.
So what do people think happened?
but did not want to "color" the potential response and wanted to see if anyone has any other ideas.
